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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-11499) Check of executorThreadsStarted in ValueQueue#submitRefillTask() evades lock acquisition
Date Thu, 22 Jan 2015 00:06:37 GMT
Ted Yu created HADOOP-11499:
-------------------------------

             Summary: Check of executorThreadsStarted in ValueQueue#submitRefillTask() evades
lock acquisition
                 Key: HADOOP-11499
                 URL: https://issues.apache.org/jira/browse/HADOOP-11499
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


{code}
    if (!executorThreadsStarted) {
      synchronized (this) {
        // To ensure all requests are first queued, make coreThreads =
        // maxThreads
        // and pre-start all the Core Threads.
        executor.prestartAllCoreThreads();
        executorThreadsStarted = true;
      }
    }
{code}
It is possible that two threads executing the above code both see executorThreadsStarted as
being false, leading to executor.prestartAllCoreThreads() called twice.



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